Air bag table

ABSTRACT

An air bag table for use in vehicles having an air bag which can not stand by itself but is capable of being inflated with gas and forming a substantially flat plane at one portion thereof, a fixture for mounting the air bag on a desired portion in a vehicle compartment, a device for sealing gas in the air bag, and a pressure regulator, whereby when a vehicle passenger strikes against the inflated air bag, it automatically discharges the sealed gas from the air bag to safely protect the vehicle passenger.

United States Patent Kobori [451 Mar. 21, 1972 54] AIR BAG TABLE FOREIGNPATENTS OR APPLICATIONS [72] In n r: Yasusaburo Kobori, y p n 824,3548/1968 Canada ..297/DlG. 3

[73] Assignee: Techikawa Spring Co., Ltd., Tokyo, Japan PrimaryExaminer-Paul R. Gilliam [22] Wed: Sept- 1970 Attorney-Hill, Sherman,Meroni, Gross & Simpson Appl. No.: 69,582

[ 5 7] ABSTRACT An air bag table for use in vehicles having an air bagwhich can not stand by itself but is capable of being inflated with gasand forming a substantially flat plane at one portion thereof, a fixturefor mounting the air bag on a desired portion in a vehicle compartment,a device for sealing gas in the air bag, and a pressure regulator,whereby when a vehicle passenger strikes against the inflated air bag,it automatically discharges the sealed gas from the air bag to safelyprotect the vehicle passenger.

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Yasusaburo Mbar/ ATTORNEYS AIR BAG TABLE BACKGROUND OF THE INVENTION 1.Field of the Invention This invention relates to an air bag table, andmore particularly to an air bag table which can be used not only as atable in vehicles such, for example, as automobiles, trains, airplanesand the like but also as a kind of safety device for protectingpassengers from shocks when involved in a head-on collision and likeaccidents.

2. Description of the Prior Art A folding or collapsible table isprovided at the seat in, for example, an airplane but this table isusually made of wood or like relatively hard material, so that if apassenger should be thrown against such table in the event ofa crash, hewould be badly injured thereby. Namely, such a table is very dangerousonce the vehicle has become involved in an accident. Accordingly, thetable must be folded except when used. However, even if folded, thetable is still dangerous for the human body because such a tableheretofore employed in the vehicle is made ofa hard material as abovedescribed.

SUMMARY OF THE INVENTION One object of this invention is to provide anovel air bag table which is free from the aforementioned defectinevitably encountered in the conventional table and positively protectsthe life of vehicle passengers in the event of a collision.

Another object of this invention is to provide an air bag table which isreadily installed, for example, on the seat of an automobile.

A further object of this invention is to provide a collapsible andinflatable air bag table.

Still a further object of this invention is to provide an air bag tablewhich is provided with means for detecting an impact produced in theevent of sudden braking or a crash of an automobile or the like andautomatically deflating the inflated air bag table.

Other objects, features and advantages of this invention will becomeapparent from the following description taken in conjunction with theaccompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a side view showing oneexample of an air bag table of this invention when mounted on the seatofa vehicle;

FIG. 2 is a side view of the air bag table in its deflated condition;

FIG. 3 is a top plan view of the air bag table shown in FIG. 1;

FIG. 4 is an enlarged side view of the principal portion of the air bagtable depicted in FIG. 1;

FIGS. 5 and 6 are a front view and a plan view of the principal portionof the air bag table shown in FIG. 4;

FIG. 7 is an enlarged plan view illustrating one example of a safetyvalve employed in the air bag table of this invention;

FIG. 8 is a longitudinal-sectional view taken along the line VIIlVllI inFIG. 7;

FIG. 9 is an enlarged plan view showing one example of an exhaust valveused in this invention;

FIG. 10 is a longitudinal-sectional view taken along the line X-X inFIG. 9;

FIG. 11 is a longitudinal-sectional view, similar to FIG. 10, forexplaining the operation of the exhaust valve depicted in FIGS. 9 and10;

FIG. 12 is an enlarged plan view showing one example of a check valveused in this invention;

FIG. 13 is a longitudinal-sectional view taken along the line XIII-XIIIin FIG. 12;

FIG. 14 is an enlarged plan view illustrating a modified form of thesafety valve;

FIG. 15 is a longitudinal-sectional view taken along the line XV-XV inFIG. 14;

FIG. 16 is an enlarged side view showing another modified form of thesafety valve;

FIG. 17 is a plan view of the safety valve depicted in FIG. 16;

FIG. 18 is a sectional view taken along the line XVIII- XVIII in FIG.17;

FIG. 19 is a perspective view showing a modification of the air bagtable when mounted on the seat of a vehicle;

FIG. 20 is an enlarged side view, partly cut away, of the air bag tableshown in FIG. 19;

FIG. 21 is an enlarged diagram showing one portion of the air bag tabledepicted in FIG. 20; and

FIGS. 22A, 22B and 22C are perspective views showing other modificationsof the air bag table of this invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A detailed description will begiven of the air bag table 1 (an elastic inflatable bag) of thisinvention as being applied to an automobile.

In FIG. 1 there is illustrated the air bag table 1 inflated with air.The air bag table 1 is made of cloth of nylon, polyethylene or likesynthetic resin material which-is airtight and abundant in elasticity.As shown in the figure the air bag table 1 is fixedly mounted, forexample, on the back of the front seat 4 of the automobile by means of afixture 2 made of, for example, a metal and attached to the air bagtable 1. It willbe seen that the air bag table 1 made of theaforementioned material does not stand itself but expands and standsitself when supplied with gas, for example, air pressure. The air bagtable 1 is designed so that its one portion become flat when inflated.Reference numeral 3 indicates a pressure regulator such as an exhaust orsafety valve, by means of which the gas sealed in the air bag table 1 isautomatically discharged therefrom upon occurrence of an abnormal riseof the internal pressure of the air bag table 1 resulting from strikingof a vehicle passenger against the air bag table 1 due to an externalshock in the event of a crash or like accident. Reference numeral 5designates a gas supply pipe ,for delivering, for example, air into theair bag table 1 and this pipe 5 is connected to a check valve 6 formedin the air bag table 1. Reference numeral 7 indicates an exhaust valveor plug for rapidly exhausting'the air bag table 1 when the air bagtable 1 is folded down. FIG. 2 is a side view of the air bag table 1 inits folded condition, in which the air bag table 1 is folded downclosely to the back of the front seat 4 and scarcely occupies the spacebetween the front seat 4 and the rear seat 4, and hence hardly impedesthe passengers movement.

FIGS. 3 and 4 are respectively enlarged top plan and side views of theair bag table 1. On the upper portion of the air bag table 1 there isattached a tablecloth or plate 8 formed of a relatively soft materialsuch, for example, as rubber, plastic or the like, by which the upperportion of the air bag table 1 is held fiat when the air bag table 1 isinflated with air. However, the tablecloth 8 may be dispensed with ifthe air bag table 1 is made thick at its upper portion.

FIGS. 5 and 6 are enlarged front and plan views of the air bag table 1.As indicated by broken lines in the figures, the air bag table 1 mayhave provided therein plural, in the illustrated example two diaphragmsor partition walls 9 for maintaining the air bag table 1 in such apredetermined shape as depicted when the air bag table is inflated.Namely, the air bag table 1 is divided by the diaphragms 9 into aplurality of rooms. In this case the diaphragms 9 have formed therein,for example, small apertures (not shown) to permit intercommunication ofthe rooms.

FIGS. 7 and 8 are respectively enlarged plan and cross-sectional viewsshowing in detail one example of the aforementioned pressure regulatordevice 3. Reference numeral 3, designates a tube as of plastic, whoseflange 3,, is hermetically fastened to the margin of an opening 1, of,for example, the side wall of the air bag table 1. The open end of thetube 3, is sealed by a seal plate 3 of a similar material to that of thetube 3, and a seal plate retainer cap 3;, of a similar material isthreadably engaged with the tube 3, from the outside. With such anarrangement, when a passenger, for example, strikes against the air bagtable 1 to cause a sudden rise of the internal pressure of the air bagtable 1, the seal plate 3 is ruptured to permit automatic deflation ofthe air bag table 1, so that the air bag table 1 provides cushioningeffect to the passenger to safely protect the passenger. The strength ofthe seal plate 3 and the size of the opening 1, are selected to ensuresuch an effect,

FIGS. 9 to 11 are respectively enlarged top plan and side views showingone example of the aforementioned exhaust valve or plug 7. Referencenumeral 7, indicates a tube with one end closed, whose flange ishermetically fastened to the margin of an opening 1 formed in, forexample, the upper side wall of the air bag table 1 and the tube 7, hasbored therein openings 7,. Reference numeral 7,, indicates a tubularplug with one end closed, which is screwed into the tube 7, in anairtight manner and openings 7 are formed in the tubular portion of theplug 7,, in the vicinity of its closed end. In FIG. 10 the openings 7 ofthe tube 7, are not aligned with those 7,, of the plug 7,, in which casethe air bag table 1 is held airtight. While, in FIG. 11 the plug 7,, isshown to have been turned relative to the tube 7, to bring its openings7 into alignment with those 7 3 of the tube 7, Accordingly, in this casethe air bag table 1 is open to the air. Namely, air in the air bag table1 can be freely released to the outside through the exhaust valve 7 asshown by arrows.

FIGS. 12 and 13 are respectively enlarged plan and crosssectional viewsshowing one example of the aforementioned check valve 6 employed in thepresent invention. The check valve 6 consists of a pipe 6, having itsflange 6,, hermetically fastened to the margin of an opening 1;, in theside wall of the air bag table 1, a spring 6 disposed in the pipe 6, anda ball 6, pressed by the spring 6 to close a narrow path 6 in the pipe6,. When air is supplied in a direction of an arrow a through the pipe5, the ball 6, is pressed down against the force of the spring 6 toprovide a gap between the ball 6 and the narrow path 6 to permitdelivery of air into the air bag table 1. Stopping the delivery of air,the ball 6 is pressed again by the spring 6 to close the narrow path 6,,so that air in the air bag table 1 cannot be released to the outsidethrough the path 6 The inflation of the air bag table 1 may take placeby means of, for example, an electromotive compressor or the like (notshown), in which case air can be automatically delivered only bydepressing a switch button into the air bag table 1 through the airsupply pipe 5 and the check valve 6. It is also possible to employ ahigh-pressure gas cylinder, a grip type pump, foot pump or the like forthe inflation of the air bag table 1. The air bag table 1 may beinflated by breathing thereinto through a rubber pipe connected to thepipe 5. In the case of using the compressor or the high-pressure gascylinder for putting air into the air bag table 1, it is preferred toemploy an automatic control device for the internal pressure of the airbag table 1.

While, the fixture 2 attached to the air bag table 1 is made of, forexample, a resilient metal substantially in a U-letter configuration andmay be mounted on the back of the seat by means of harness snap(detachably) or may be screwed directly to the seat or attached to theframework of the seat.

Referring now to FIGS. 14 and 15, a description will be given of amodified form of the pressure regulator device 3 for discharging airsealed in the air bag table 1 when the passenger strikes against it tocause a sudden rise of its internal pressure. In the present examplethere is formed, for example, in the side wall of the air bag table 1 anopening 1., which is large enough to permit the passage therethrough ofair in the air bag table 1 at a suitable speed, and the opening 1., ishermetically sealed from the outside with a film 3a formed of the samematerial as that of the air bag table 1 but thinner than the latter.When a travelling vehicle is involved in a collision, the object of theso-called secondary collision that a passenger is thrown against thevehicle compartment by inertia is the air bag table 1, and consequentlyits internal pressure rides suddenly. Then, the film 3a is ruptured, bywhich air in the air bag table 1 is automatically released to theoutside through the opening 1, to thereby rapidly lower the internalpressure of the air bag table 1. Thus, the air bag table 1 alleviatesand absorbs inertia of the passenger thrown against it without renderingreaction to him, thereby protecting him from injury due to the so-calledsecondary collision.

FIGS. 16, 17 and 18 show other modified forms of the pressure regulatordevice or safety valve 3 which is adapted to automatically deflate theair bag table 1 upon occurrence of a collision and absorb inertia of avehicle passenger striking against the air bag table 1 without renderingreaction to him thereby to protect him from injury. In the illustratedexample there is formed, for example, in the upper portion of the airbag table 1 an exhaust port 1 large enough to permit release of thesealed air in the air bag table 1 at a suitable speed and, for example,a disc-shaped base plate 3b having bored therein an opening 3b, similarto the exhaust port 1, is hermetically fastened to the air bag table 1in such a manner that the opening 3b, is aligned with the exhaust port1,, and a cup-shaped cover 30 is screwed on to the base plate 3b at itsperiphery. While, openings 3c, for discharging air in the air bag table1 is formed in the cover 3c at its top.

Around the centrally disposed opening 3b, of the discshaped base plate3b there is secured thereto a circular sealing member or packing 3dhaving formed therein an aperture 3d, and made of a slippery or sleekand airtight material such as Teflon or the like in such a manner thatthe openings 3b, and 3d, may be aligned with each other and, forexample, a round weight 3e as of iron is disposed on the sealing member3d to normally close the aperture 3d,. A slight depression Be, is formedon the top of the weight 3e centrally thereof. A ball 3f is fitted inthe depression 3e, and is rotatably enclosed in a ball receiver 30formed centrally on the inside of the cover 3c at the top thereof,while, at the same time, being pressed against the weight 3e by acompression spring 3g inserted in the ball receiver 3a,. In this case, ascrew 3h is screwed down into the ball receiver 30 to be brought intocontact with the free end of the spring 3g and the ball 3f is pressedagainst the weight 32 at a suitable pressure by adjusting the screw 3h.Reference numeral 10 indicates a support plate as of synthetic resinwhich is fastened to the interior of the air bag table 1 in a manner tomaintain the pressure regulator device 3 in the horizontal position forensuring transmission of inertial movement to the pressure regulatordevice 3.

A description will be given of the operation of the pressure regulatormeans 3. When a travelling vehicle with the air bag table 1 inflated isinvolved in a collision, its passenger is thrown against the air bagtable 1 by inertia but before the passenger strikes against the air bagtable 1, namely at the moment of crash, inertia of the weight 3e of thepressure regulator means 3 provided in the air bag table 1 overcomes thepressing force of the compression spring 33 due to the impact of thecrash and moves or slides out of its normally seated position in ahorizontal plane. Namely, the weight 32 is thrown out of position inwhich to close the openings 31;, and 1,, as shown and these openings areexposed or opened, so that the sealed air in the air bag table 1 isautomatically released through these openings and that 30,. Accordingly,when the passenger is thrown against the air bag table 1 by the inertia,the pressure regulator device 3 shall have already been rendered openand the passenger strikes against the air bag table 1 under suchconditions, so that the air sealed in the air bag table 1 is released tothe outside to gradually decrease the internal pressure of the air bagtable 1. Consequently, the passenger thrown against the air bag table 1is not ever subjected to reaction resulting from sudden increase in theinternal pressure of the air bag table 1 due to inertial force of thepassengers body and the air bag table 1 performs the function of aperfect cushion to alleviate and absorb shocks, thereby protecting thepassenger from an accident resulting from the socalled secondarycollision.

In FIGS. 19, 20 and 21 there is illustrated another modification of theair bag table 1 'of this invention, in which reference numerals similarto those in the foregoing indicate similar components. The presentexample is different from the.

foregoing examples in the provision of an automatic pressure regulatordevice 3 which is disposed inside of the air bag table 1 and adapted toinitiate automatic deflation of the air bag table 1 when an impactproduced in a travelling vehicle exceeds a predetermined value. In theillustrated example the automatic pressure regulator device 3 is made upof a rod 3A pivoted at one end to, for example, the upper flat portion1a of the air bag table 1, a substantially spherical weight 38 made of,for example, iron or the like and attached to the free end (the lowerend) of the rod 3A and an opening 3 bored in one 7 vertical flat portion1,, of the air bag table 1. The weight 3B has a projection 313 and acord 3B is fixed to the free end of the projection 38,, one end of thecord 3B being retained outside of the air bag table 1. The opening 3 hasa projecting tube 3 projecting inwardly of the air bag table 1.

In the case of putting air into the air bag table 1 through the pipe 5and the check valve 6, the cord 3B is pulled by hand to insert theprojection 3B of the weight 3B into the projecting tube 3 of the opening3 Thus, the air bag table 1 is inflated in a predetermined shape asshown. Namely, under such conditions, the rod 3A of the pressureregulator device 3 is substantially vertical and the projection 3B ofthe weight 38 is hermetically fitted in the projecting tube 3,, of theopening 3, so that air sealed in the air bag table 1 cannot be releasedout therefrom. It will be seen that under such conditions, the upperflat portion in of the air bag table 1 is held substantially horizontaland that the air bag table 1 performs the function of a usual table.

Assume that when a travelling vehicle having the air bag table inflatedin the above conditions is involved in, for example, a head-oncollision, an inertial force of, for example, about 156 is caused in theweight 38. If the frictional force for the engagement of the projection38 with the inwardly projecting tube 3 of the opening 3 is previouslyselected smaller than the inertial force of 156, the projection 3B ofthe weight 38 is forwardly thrown out from the opening 3 in the event ofthe collision. In this case, when a vehicle passenger or other object inthe vehicle compartment strikes against the air bag table 1 air sealedtherein is discharged through the opening 3 to automatically deflate theair bag table 1. Accordingly, the air bag table 1 renders no reaction tothe passenger thrown thereagainst and absorbs a shock given to him tothereby protect his like.

The condition for the disengagement of the weight 38 from the opening 3namely the value of an impact detected by the weight 33 need not belimited specifically to 156. Since the value of the impact detected bythe weight 3B is dependent mainly upon the frictional force between theprojection 33 of the weight 38 and the inwardly projecting tube 3,, ofthe opening 3 the value of the impact can be adjusted at will bysuitably selecting, for example, the diameter of the projection 38,relative to those of the opening 3 and the inwardly projecting tube 3 orselecting the material of them or forming suitable depressions on theirengagement faces. Further, the value of the impact detected by theweight can also be adjusted by suitably selecting inclination of the rod3A relative to a vertical direction. In practice, the value of theimpact can be adjusted by suitable selection of the density or shape ofthe weight, too.

In FIG. 20 reference numeral 11 indicates generally one example of adevice for adjusting the position of the upper flat portion 1a of theair bag table 1 to be substantially horizontal when the air bag table 1has been mounted by the fixture 2 on the seat 4. This adjusting device 11 comprises a bolt 11A fixed at one end to one side 10 of the air bagtable 1 opposite from the side lb and a pad or adsorbing plate 118threadably engaged with the free end of the bolt 11A. The adsorbingplate 11B adsorbs or rests on the back 4A of the seat 4 when the air bagtable 1 is mounted on the seat 4. By moving adsorbing plate 11B on thebolt 11A under such conditions, the flat portion 1a of the air bag table1 is adjusted to be horizontal.

FIGS. 22A, 22B and 22C show other modified forms of the air bag table ofthis invention which are different in shape from that above described.Although not shown, these air bags 1 1 and 1 are provided with exactlythe same means as those above described and yield exactly the sameoperational effects as those previously described. That is, the shape ofthe air bag table can be freely selected according to the kind and shapeand the like of a vehicle in which the air bag table is to be installed.

When the air bag tables are not practically used, they can be foldeddown with ease by inwardly pushing the projection 3B, of the weight 33and by deflating the air bag tables through the opening 3 and when theyare in deflated condition they do not ever impede any motion of thepassenger in the vehicle compartment as in the foregoing example;

The following Table shows one example of experimental results as to howmuch a vehicle passenger in the rear seat 4 could be protected frominjury by the air bag table of this invention mounted on the back of thefront seat 4 in the event of a collision of a vehicle, for example, anairplane, an automobile or the like, as compared with a conventionalsafety belt.

Experimental Data obtained at Yatabe Reported by Japan AutomobileManufactures Association Published Oct., 1966 NorE.-In the event of acollision 50G regarded as critical limit oi the life of a passenger, sothat his life can be protected by the provision of the air bag table ofthis invention.

As will be apparent from the above Table, an inertial movement of anacceleration of, for example, 134.46 in the event of an automobileaccident can be alleviated by the air bag table of this invention to aninertial movement of an acceleration of 17.86. Accordingly, it has beenproved that the air bag table of this invention could well protect thelife of the passenger when involved in a collision which would producean acceleration of about 134.46.

According to a report issued by the Biodynamics Section (Impact Test) ofAeromedical Laboratory of JASDAF observing injuries to the Human body inAirplane accidents, the injuries are generally centered at the foreheadsand knees of the passengers. The air bag table of this invention isinwardly curved to conform with the figure of a sitting passenger fromhis knee to breast and is disposed between the passenger and the frontseat, so that in the event of a collision he is prevented by the air bagtable from moving vertically and he moves by inertia only in ahorizontal direction. Accordingly, the upper half of his body isreceived softly by the air bag table disposed between him and the frontseat as above described to thereby protect his bust.

Although the present invention has been described in connection with thecase where the air bag table is mounted on the back of the front seat inthe vehicle compartment, it will be readily understood that the air bagtable can be installed at any desired position other than the back ofthe front seat by suitably designing the fixture 2 or by means of boltsor the like.

It will be apparent that many modifications and variations may beeffected without departing from the scope of the novel concepts of thisinvention.

I claim as my invention 1. An air bag table for use in vehiclescomprising an air bag which can not stand by itself but is capable ofbeing inflated with a gas and forming an air bag table with asubstantially flat plane at one portion, fixture means for mounting theair bag near a vehicle passenger in the vehicle compartment, means forsealing the gas in the air bag, and pressure regulator means forautomatically discharging the sealed gas from the air bag in the case ofsudden rise of the pressure of the sealed gas result ing from strikingof the passenger against the inflated air bag table due to an externalshock said air bag table has formed therein a plurality of diaphragmsfor ensuring maintenance of the air bag table in a predetermined shapewhen inflated.

2. An air bag table as claimed in claim 1 which further includes meansfor maintaining the upper surface of the air bag table substantiallyhorizontal when it is inflated.

3. An air bag table as claimed in claim 1 which is substantiallyL-shaped in cross-section when inflated, its horizontal portioncorresponding to the knee and breast of a passenger sitting in a seat tothereby prevent the vertical movement of the passenger.

4. An air bag table as claimed in claim 1 wherein the pressure regulatormeans comprises a disc fastened to the air bag on the outside thereof,the disc having an opening aligned with an opening bored in the air bag,a cover having openings and secured to the margin of the disc, a weightdisposed on the opening of the disc and normally closing the twoopenings, and a spring means provided in the cover for pressing theweight, the force of the spring means being adjusted so that when theweight is supplied with a force exceeding a predetermined valueresulting from the accident of the travelling vehicle, the weight movesagainst the force of the spring means to open the openings of the airbag and the disc, thereby automatically discharging air sealed in theair bag.

5. An air bag table as claimed in claim 1 wherein the pressure regulatormeans comprises a weight having a projection and suspended in the airbag table as a pendulum and an opening formed in the air bag forreceiving the projection, the pressure regulator means being adapted sothat when a force exceeding a predetermined value is rendered to theweight, the projection disengages from the opening of the air bag toautomatically discharge air in the air bag to absorb impact of thepassenger thrown thereagainst to protect him without rendering anyreaction to him.

6. An air bag table as claimed in claim 5 wherein a cord is fixed at oneend to the top of the projection formed on the weight and the other endof the cord is led out from the air bag so as to facilitate engagementand disengagement of the projection with and from the opening of the airbag.

7. An air bag table as claimed in claim 1 wherein the pressure regulatormeans comprises an opening formed in the air bag and a thin filmnormally closing the opening in an airtight manner, the film being morereadily ruptured than the air bag to discharge air sealed in the air bagwhen the pressure in the air bag is increased as compared with thenormal value.

1. An air bag table for use in vehicles comprising an air bag which cannot stand by itself but is capable of being inflated with a gas andforming an air bag table with a substantially flat plane at one portion,fixture means for mounting the air bag near a vehicle passenger in thevehicle compartment, means for sealing the gas in the air bag, andpressure regulator means for automatically discharging the sealed gasfrom the air bag in the case of sudden rise of the pressure of thesealed gas resulting from striking of the passenger against the inflatedair bag table due to an external shock said air bag table has formedtherein a plurality of diaphragms for ensuring maintenance of the airbag table in a predetermined shape when inflated.
 2. An air bag table asclaimed in claim 1 which further includes means for maintaining theupper surface of the air bag table substantially horizontal when it isinflated.
 3. An air bag table as claimed in claim 1 which issubstantially L-shaped in cross-section when inflated, its horizontalportion corresponding to the knee and breast of a passenger sitting in aseat to thereby prevent the vertical movement of the passenger.
 4. Anair bag table as claimed in claim 1 wherein the pressure regulator meanscomprises a disc fastened to the air bag on the outside thereof, thedisc having an opening aligned with an opening bored in the air bag, acover having openings and secured to the margin of the disc, a weightdisposed on the opening of the disc and normally closing the twoopenings, and a spring means provided in the cover for pressing theweight, the force of the spring means being adjusted so that when theweight is supplied with a force exceeding a predetermined valueresulting from the accident of the travelling vehicle, the weight movesagainst the force of the spring means to open the openings of the airbag and the disc, thereby automatically discharging air sealed in theair bag.
 5. An air bag table as claimed in claim 1 wherein the pressureregulator means comprises a weight having a projection and suspended inthe air bag table as a pendulum and an opening formed in the air bag forreceiving the projection, the pressure regulator means being adapted sothat when a force exceeding a predetermined value is rendered to theweight, the projection disengages from the opening of the air bag toautomatically discharge air in the air bag to absorb impact of thepassenger thrown thereagainst to protect him without rendering anyreaction to him.
 6. An air bag table as claimed in claim 5 wherein acord is fixed at one end to the top of the projection formed on theweight and the other end of the cord is led out from the air bag so asto facilitate engagement and disengagement of the projection with andfrom the opening of the air bag.
 7. An air bag table as claimed in claim1 wherein the pressure regulator means comprises an opening formed inthe air bag and a thin film normally closing the opening in an airtightmanner, the film being more readily ruptured than the air bag todischarge air sealed in the air bag when the pressure in the air bag isincreased as compared with the normal value.